Machine for grinding pulleys



V(No Model.) y

P. MEDART.

MACHINE FOR GRINDINGPULLYS. No. 256,440. Y Patented Apr.11,.1882.

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I lJNiTED STATES PATENT Ormea o PHILIP MEDARI, OF ST. LOUIS, MISSOURI.

MACHINE FOR G'RINDING PULLEYS.

SPECIFICATION forming part of Letters-'Patent-No. 256,440, dated April 11, 1882.

' Appncann inea september aissij (No model.)

To all whom it may concern:

Be it known that l, PHILIP MEDART, a citizen of the United States, and a resident ot' theV city of St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Machines for Grinding Pulleys, of which the following is a specification.

My invention relates to certain improvements in thatclass of grinding-machines used for grinding off the face of belt-pulleys concentric to and parallel with their axes; and this invention consists in certain details of construction and arrangement of parts to effect the said purpose in an accurate, quick, `and effective manner, as will hereinafter more fully appear.

Inl the drawings, Figure l is a top plan; Fig. 2, a vertical section on a line through the axis ofthe pulley-carrying arbor; Fig. 3, an enlarged detail section through one ofthe guideslides of the main frame; Fig. 4, an enlarged detail section transverse .to Fig. 3.

Similar letters of reference refer to like parts in the several views.

As shown in the drawings, the machine consists of a rectangular bed or shears, A, supported `on legsB, and provided with raised slides ci, upon which the carriage G (that carries the pulley-arbor D) slides and is guided in aline parallel with the face of the grindingwheel E, the movement of the carriage'being accomplished by a pair of feed-screws, c c', arranged at each side of the bed A, as shown,

' and geared together by means of chain-wheels c2 c2 and chain c3, or their equivalents, so as to turn in unison. c4 is-a hand-wheel, by which the said feed-screws are operated. This improved construction entirely overcomes the difculties to which an ordinary central feedscrew is liable, as follows: rst, the diculty of obtaining a perfect'movement of the pulleycarrying carriage ina plane parallel with the axis ofthe grinding-wheel; second, theliability of the carriage being displaced from such position by an undue strain on `the parts or an uneven wear of same', and, third,the liability of the carriage being forced out of line by the impact or strain of the grinding-wheel upon the pulley, all of which difficulties are entirely overcome in a very effective manner by my improved construction. A

The pulley-carrying arbor D is supported in bearin gs d d, as shown, and is capable of both an endwise movement (so as to feed the pulley across the face of the grinding-wheel E) and a rotary movement in an opposite direction to that of the said grinding-wheel.

manner:

D is a box moying in slides on the overhanging or extension part C ofthe carriage C, and operated by an endless feed-screw, c5, that is rotated by gear-wheels c6 c7, counter-shaft ce, and hand-wheel o9. The end of the arbor D is secured to and turns in the box D', so that when any movement is imparted to the said box a like movement will. in turn be imparted to the arbor D. At the opposite end to where it is attached; to the box D the carrying-arbor D overhangs the bed A, and .is provided wit-h a head, d5, for the attachment of the pnlley-carrying mandrel or chuck f, the attachy ment between the mandrel fand the head d5 being accomplished by the one screwing onto the other, or by means of any other well-known means of attachment.

The advantages derived by making the atrIhe endwise` 'movement is'accomplished in the following tachment of. the pulley (to be ground) to the attaching-head of the carriage-arbor, outside of the main frame, as 'shown,iare as follows: First, it allows for the grinding of a pulley of any required width of face 5 second, it permits of grinding a pulley of any required diameter without necessitating the use of a heavy and 'cumbersome machine; third, it forms aready,

easy, and accurate means for the axial attachment of the pulley to be operated upon, and facilitates any required change in the size of the pulley-mandrel to suit the various sized carriage C, and driven by a stationary pulley, G, the connection between the said pulley G and shaft g being by means of a spline and groove, so as to allow for the necessary endwise movement ofthe shaft g through the pnlley G. One ofthe supporting-boxes, g3, for the shaft gis arranged upon the carriage C, while the other, g2, is arranged upon the main bed or shears, as clearly indicated in Fig. l.

It will be seen that by means of the gears eG c" and counter-shaft e8, the hand-wheels c4 c9 are brought into an adjacent position to each other, so that they will be convenient to the operator and enable him to effect the different movements of feeding the pulley toward and across the face of the grinding-wheel without changing his position.

'Ihegrinding-wheel E is arranged to one side otl the bed or shears A, as shown, and one of its supporting-boxes, e, is arranged on said bed, while the other, e', is arranged on the outer end of a. bracket-frame, E', secured to the bed or shears A, as shown in Ifig. 2.

The bracket-.frame is of a bent form, as shown, so as to have a recessed portion, E', for the reception of the grinding-wheel, and such recessed portion may be arranged in either a vertical or horizontal position, as may be found most desirable or convenient.

Having thus fully described my said invention, what I claim as new, and desire to secure by Letters Patent, is-

1`.' In a machine for grinding pulleys, the

combination of a pulley-carrying arbor having its end to which the pulley is attached over hanging the main frame, a grinding-wheel arranged to one side of the main frame, with its axis on a line parallel with the axis of the pulley-carrying arbor, and lneans for feeding the pulley across the face of the grinding-wheel, substantially as described.

2. In a machine for grinding pulleys, the arbor-carriage C, provided with au overhanging or extension part C', in combination with the carrying-arbor D, box D', and feed-screw c5, substantially as herein described, and for the purpose set forth.

3. In a machine for grinding pulleys, the combination of a pulley-carrying arbor having its pulley-carrying head overhanging the main frame, a grindingwheel arranged to one side of said frame with its axis on a line parallel with the axis of the pulley-carrying arbor, an arbor-carriage, C, and duplicate operatingscrews e c', arranged atthe sides of the main frame, and connected together so as to operate in unison, for the purpose set forth.

4. A machine for grinding pulleys, consisting of a bed or shears, A, arbor D, feed-screws c c', and grinding-wheel E, iu combination with the traveling shaft g, driving-pulley G, gears d2 d4, box D', and feed-screw c5, all arranged substantially as described, and for the purpose set forth.

5. A machine for grinding pulleys, consisting ot' a bed or shears, A, grinding wheel E, carriage G, feed-screws c e', chain-wheels c2, chain c3, hand-wheel e, arbor D, box D', feedscrew c5, gears c' c7, counter-shaft o8, hand-wheel ci', gears d2 d4, traveling shaft g, and drivingpulley G, all arranged substantially as herein described, and for the purpose set forth.

In testimony whereof witness my hand at St.. 

